Synthesis, polymorphs, and luminescent properties of oligomeric Zn3ppo6

Oligomeric Zn 3 ppo 6 , where ppo is 2-(2-hydroxyphenyl)-5-phenyl-1,3-oxazole, has been synthesized as a new blue-emitting material for organic light-emitting diodes (OLEDs). The electroluminescence maximum wavelength is 450 nm and the Commission Internationale de l'Eclairage (CIE) coordinates are x = 0.15, y = 0.11 for blue chromaticity. The luminance efficiency and the maximum luminance were about 1.3 lm/W at 6 V, 5.8 mA/cm 2 (139 cd/ m 2 ), and 8140 cd/m 2 at 11.4 V. Zn 3 ppo 6 shows two trimeric polymorphs and a monomeric structure at different sublimation temperatures.